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QUESTION
There is a Java 11 (SpringBoot 2.5.1) application with simple workflow:
- Upload archives (as multipart files with size 50-100 Mb each)
- Unpack them in memory
- Send each unpacked file as a message to a queue via JMS
When I run the app locally java -jar app.jar its memory usage (in VisualVM) looks like a saw: high peaks (~ 400 Mb) over a stable baseline (~ 100 Mb).
When I run the same app in a Docker container memory consumption grows up to 700 Mb and higher until an OutOfMemoryError. It appears that GC does not work at all. Even when memory options are present (java -Xms400m -Xmx400m -jar app.jar) the container seems to completely ignore them still consuming much more memory.
So the behavior in the container and in OS are dramatically different.
I tried this Docker image in DockerDesktop Windows 10 and in OpenShift 4.6 and got two similar pictures for the memory usage.
Dockerfile
...ANSWER
Answered 2021-Jun-13 at 03:31In Java 11, you can find out the flags that have been passed to the JVM and the "ergonomic" ones that have been set by the JVM by adding -XX:+PrintCommandLineFlags to the JVM options.
That should tell you if the container you are using is overriding the flags you have given.
Having said that, its is (IMO) unlikely that the container is what is overriding the parameters.
It is not unusual for a JVM to use more memory that the -Xmx option says. The explanation is that that option only controls the size of the Java heap. A JVM consumes a lot of memory that is not part of the Java heap; e.g. the executable and native libraries, the native heap, metaspace, off-heap memory allocations, stack frames, mapped files, and so on. Depending on your application, this could easily exceed 300MB.
Secondly, OOMEs are not necessarily caused by running out of heap space. Check what the "reason" string says.
Finally, this could be a difference in your app's memory utilization in a containerized environment versus when you run it locally.
QUESTION
I am getting a java outofmemory error. I added the necessary java arguments, but I still keep getting this error. I shared the libraries and functions that I use. The function It gives this error when converting a large csv file (about 15mb) into an xlsx file. It working properly on small files without any errors. How can i fix this error? Thanks.
I added these java args on Intellij Idea
Main
...ANSWER
Answered 2021-May-13 at 11:49This line:
QUESTION
I tried to run a load test in jmeter with 3000 users and 50 loops.But it shows this error.
...ANSWER
Answered 2021-Apr-19 at 13:50I don't think amending heap will help, the root cause of this error is that underlying operating system isn't capable of creating a new thread.
- If you're using 32-bit Java - upgrade to 64-bit server JRE
- If you're running Linux - check
max user processesvalue using ulimit command - Reduce stack size via -Xss option
If you already tried everything - the only workaround would be installing JMeter on one more machine and go for Distributed Testing
QUESTION
We have an application that runs with OSGi with 1 GB RAM. It runs on some kind of embedded device and therefore is limited to 1 GB RAM. We use Felix without Karaf, because Karaf turned out to bog down the application too much.
The problem is now that we continously run into OutOfMemory errors. The heap dump analysis shows this picture:
- org.apache.felix: 30% (of which org.apache.felix.framework consumes 22 %)
- org.hsqldb: 22%
- io.vertx: 24%
- io.netty: 15%
- our own application package: 0.35%
My question is now whether OSGi aka Felix consuming 30% of the RAM at disposal for the application is "normal". Is there any experience how much RAM is >>typically<< consumed by OSGi? Do those 30% also include RAM used up by objects of our application or is this purely the RAM consumed by Felix?
...ANSWER
Answered 2021-Apr-19 at 10:04Establishing the memory owners is always tricky, and mostly non-intutive, and I find it often not that useful. I am not sure how you measure the memory layout but since Felix holds the roots, this might heavily skew the allotted amounts.
In my experience, when you get out of memory errors, there is some leak going on. So I tend to focus on what is the memory that grows after initial startup that is of the same type. Especially with lambdas today, it is very easy to create references that prohibit garbage collection.
If the Java VM has 1Gb then I fail to see how OSGi could be visible? The amount of memory needed by OSGi is quite minimal and should not grow after startup. Also, the fact that you had problems with Karaf seems to hint there is something fishy going on here. After initial startup, OSGi should be out of your way unless you use it in creative ways.
I assume you already set the different tuning parameters of the VM?
Ah well, I remember running OSGi in a 12Mb router ...
QUESTION
I have a big stream (4Go), I need to replace some character (I need to replace one specific character with 2 or 3 ones) in that stream, i get the stream from à service à.d I have to return back a stream. This is what I'm doing
...ANSWER
Answered 2021-Apr-02 at 21:26This is not an answer, but I couldn't possibly fit it into a comment.
Currently your problem is not solvable without making some assumptions. The problem, as I hear it, is that you want to replace some parts of a large body of text saved in a file and save the modified text in the file again.
Some unknown variables:
- How long are those strings you are replacing?
- How long are those strings you are replacing it with? The same length as the replaced strings?
- What kinds of strings are you looking to replace? A single word? A whole sentence? A whole paragraph?
A solution to your problem would be to read the file into memory in chunks, replace the necessary text and save the "updated" text in a new file and then finally rename the "new file" to the name of the old file. However, without knowing the answers to the above points, you could potentially be wanting to replace a string as long as all text in the file (unlikely, yes). This means in order to do the "replacing" I would have to read the whole file into memory before I can replace any of the text, which causes an OutOfMemoryException. (Yes, you could do some clever scanning to replace such large strings without reading it all into memory at once, but I doubt such a solution is necessary here).
Please edit your question to address the above points.
QUESTION
I am using recyclerview to display some textviews. I am collecting data from the SQLite database.
This is the helper class for database:
...ANSWER
Answered 2021-Mar-30 at 05:48In the Database Helper DBHelper method seeDate you have :
QUESTION
My app uses Infinispan's Spring Session implementation via the Infinispan Spring Boot Starter. I am using the embedded mode via InfinispanEmbeddedHttpSessionConfiguration. The Spring Session integration documentation is pretty sparse, and it doesn't mention anything about the recommended cache mode for the session cache.
I have been using the DIST_SYNC mode, but I notice occasional ConcurrentModificationException errors in the log. Is there a more appropriate cache mode, or could this be a bug?
I am using Spring Boot 2.2.10, Infinispan 9.4.20 and Spring Session 2.2.0. The app runs under JDK 11.
Edit
The exception I observe in the logs is below. I've put xxx. in place of my company's package names for our filters.
The exception occurs when the same session is reused in quick succession, in particular when our external security vendor runs weekly scans on our app. The exception does not occur every week. When it does occur, it leads to an eventual OutOfMemory error on the node that did not get the ConcurrentModificationException. The heap is full of TrianglePerCacheInboundInvocationHander$1 objects.
I have tried to reproduce the error in our development environment by running concurrent requests for 3 days, but to no avail.
I've looked at the Infinispan Spring Session code, and I see that each request gets its own instance of MapSession, materialised from the serialised data stored in Infinispan. I don't see how multiple concurrent requests for the same session could cause the ConcurrentModificationException, and I'm not aware of anywhere in my app that would allow concurrent access to a MapSession instance from multiple threads.
ANSWER
Answered 2021-Feb-16 at 09:59Using the DIST_SYNC mode for sessions should be fine.
If a ConcurrentModificationException is thrown while serializing a session attribute, then it's a sign that the application is modifying an attribute value after inserting it in the session, and it should not do that.
If a ConcurrentModificationException happens while serializing the session itself, then it's likely a bug in the Infinispan Spring Session integration.
Same if the ConcurrentModificationException is not related to serialization at all. I suggest posting the full stack trace in your question, or registering an account for the Infinispan Zulip Chat and posting the exception there.
As a final note, Infinispan 9.4.20 is pretty old, and an eventual bug fix is probably going to land only in Infinispan 12.x.
QUESTION
I'm trying to upload a zip file to Nexus repository after converting the zipe file (1.6gb) to bytes. The problem is when it readallbytes of the zip file, if the file size is big it throw system.outofmemory error. it doesn't throw the error if it's just 3-600mb, is there a way to read bytes and avoid the oufofmemory error?
Exception calling "ReadAllText" with "1" argument(s): "Exception of type 'System.OutOfMemoryException' was thrown."
$fileBin = [System.IO.File]::ReadAlltext($File)
...ANSWER
Answered 2020-Dec-15 at 22:32You probably meant .ReadAllBytes(), given that your'e not dealing with a text-based files.
However, you don't have to load the file into memory - use Invoke-WebRequest's -InFile parameter to specify a file to upload.
QUESTION
Yesterday in a coding interview I was asked how to get the most frequent 100 numbers out of 4,000,000,000 integers (may contain duplicates), for example:
...ANSWER
Answered 2020-Nov-17 at 19:26I have noticed there is a bug in this line.
QUESTION
I have had weird problems in kubernetes. When I run install command, pods never started. Pvc was bound. It gave errors below order
...ANSWER
Answered 2020-Oct-12 at 14:39I have used old cluster.yaml file and added 'allowUninstallWithVolumes: false' under cleanupPolicy. That solves everything.
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